10.1021/acs.jpcc.6b07991.s001Shinya OkamotoMasahiro DeguchiSatoshi YotsuhashiModulated III–V Triple-Junction Solar Cell
Wireless Device for Efficient Water Splitting2017American Chemical Societysolar-to-hydrogen conversion efficiencydevicegeneration efficiency1 sun illuminationIIIgermanium bottom layerpath lengthstoichiometric evolutionEfficient Water Splittingwater splitting2017-01-06 00:00:00articlehttps://acs.figshare.com/articles/Modulated_III_V_Triple-Junction_Solar_Cell_Wireless_Device_for_Efficient_Water_Splitting/4547278We report an efficient
wireless device for water splitting using
III–V triple-junction solar cells. To maximize the generation
efficiency of hydrogen, the surface catalytic electrode has to be
well designed to balance with the capability of the solar cell. We
find that another important parameter is the path length of light
in water, which needs to be short enough to sufficiently activate
the germanium bottom layer in the solar cell. The solar-to-hydrogen
conversion efficiency of the wireless device under 1 sun illumination
without an external bias reaches 11.2% at almost neutral pH, and stoichiometric
evolution of hydrogen and oxygen is confirmed.